Steam-generator.



PATBN-TBD JLY 12, 1904.

\ B.s.PB-ARD. STEAMGBNBRAT0R- APPLICATION FILED JAN. 23, 1903.

N0 MODEL.

UNTTED STATES Patented July 12, 1904.

PATENT Ormea.

BENJAMIN S. PEARD, OF NEW YORK, N. Y., ASSIGNOR TO GEORGE A. VALTON, OFNEV YORK, N. Y.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 764,761, dated July 12,1904.

Application lell January 23, 1903, Serial No. 140,212. .(No model.)

To all, w/z/ont t may concern:

Be it known that I, BENJAMIN S. PEARD, a citizen ofthe United States,residing in the borough of Brooklyn, city of New York, county of Kings,and State of New York, have invented certain new and useful Improvementsin Steam-Generators, of which the following is a specification,reference being had therein to the accompanying drawings.

My invention relates to steam-generators, and more particularly to thattype of steamgenerators wherein generator-tubes are provided, extendingdownward in close proximity to the heating-burner or fire. According tomy invention such generator-tubes are constructed and arranged with thedepending portions of adjacent generator-tubes of different lengths, sothat their lower portions terminate at different heights above theburner or heater.

My invention also includes various improve- -ments in construction andarrangement.

l will now describe the construction of steam-generators shown in theaccompanying drawings and will thereafter point out my invention inclaims.

Figure l is a vertical central section of a steam-generator embodying myinvention. Fig. 2 is a horizontal section of the same on the line 1L'a', Fig. l, looking upward.

The generator is shown as inclosed within a easing l, at the lower partof which is held a hydrocarbon-burner 2, having iiame-orifices 3 andair-passages 4:, these air-passages being the only openings from theouter air into the combustion or heating chamber. The casing terminatesat its upper end in a cap-piece 5, having a centrally-arranged stack 6,through which the products of combustion escape. The boiler is shown assupported in the casing by means of inwardly-projecting vanes 7 andcomprises a shell composed of a side wall 8, a lower crown-sheet 9, andan upper crownsheet lO. A plurality of generator-tubes ll is provided,these tubes depending from the lower crown-sheet 9, and each of thesetubes is looped or U -shaped and has ends of unequal lengths, one endterminating below the water-line 25 25 and as shown at the lowercrown-sheet and the other end terminating above such water-line.According to my invention the depending portions of the adjacent loopedgenerator-tubes are of unequal lengths, and l have found in practicethat this arrangement of the lower or iiashing points of adjacentgenerator-tubes at different heights above the burner results in a moreeifective generation of steam in the apparatus, inducing the currents ofheated gases to more evenly flow about the generator-tubes and insuringa penetration of the heated gases between the generator-tubes. As shown,there is a central row of generator-tubes in a subv stantiallydiametrical line with adjacent tubes having depending portions of thesame lengths and an adjacent row of tubes with the depending portions ofdifferent lengths and of alternate tubes in such row of the same lengthand arranged so that theirlooped portions or iiashing-points areopposite the spaces between the generator-tubes of the adjacent row oftubes, and this arrangement is adhered to throughout all thegenerator-tubes, and thus the looped portions or flashing-points in anyone row are adjacently of dierent heights and alternately of the 'sameheight and the looped portions or iiashing-points of the tubes ofadjacent rows are staggered or break joints with those of the adjacentrows. The consequence of this construction is that the surface presentedto the iire contains a plurality of flues through which currents ofheated gases are induced, and thereby a penetration of the heated gasesamong the generator-tubesis e'cct'ed, resulting in a highly -eectiveutilization of the heated gases and greatly increasing thesteamgenerating power of the boiler.

It is obvious that various modifications may beV made in theconstruction and arrangement shown and above particularly describedwithin the spirit and scope of my invention.

What l claim, and desire to secure by Letters Patent, is-

l. A steam-generator comprising a casing provided with a heating-chamberand a source of heat therein, a boiler provided with loopedgenerator-tubes depending therefrom into the heating-chamber and exposedon all sides to the heated gases insuch chamber and terminating in theboiler above and below the water-level and having their flashing-pointsdirectly exposed to the source of heat at different heights therefrom inadjacent tubes and at the same height threfrom in alternate tubes.

2. A steam-generator comprising a casing provided with aheating-chamber, a boiler provided with looped generator-tubes dependingtherefrom, each of such looped tubes having ends of unequal lengthterminating in the boiler respectively above and below the waterlevel,the depending looped portions of adjacent tubes being of. differentlengths and of alternate tubes of the same length directly eX- posed tothe source of heat.

3. A steam-generator comprising a casing provided with aheating-chamber,a boiler provided with looped generator-tubes depending therefrom, eachof such looped tubes having ends of unequal length terminating in theboiler respectively above and below the waterlevel and suchgenerator-tubes being arranged in rows, the depending portions ofadjacent tubes in the same row being' of diii'erent lengths and ofalternate tubes of the same length, and the looped portions of the tubesin one row being' adjacent to the openings between the tubes in adjacentrows, substantially as set forth.

4. A steam-generator comprising a casing provided with aheating-chamber,a boiler provided with generator-tubes depending therefrom and looped attheir lower ends, such tubes being arranged closely together and withthe depending portions of a number of tubes .of greater length than thedepending portions of the other tubes to form a plurality of openingsbetween the looped portions of the longer tubes such openings beinggreater than the space between the looped portions of the tubes at thelower ends of the. tubes.

In testimony whereofl I have aliixed my signature in presence of twowitnesses.

B. S. PEARD.

